Abstract: A multicast control device capable of reducing the distribution time of multicast data is provided. A multicast control device (10) according to the present disclosure includes a determination unit (11) configured to determine whether the number of communication terminals joining a multicast service exceeds a predetermined threshold, and a session control unit (12) configured to start a multicast session for a plurality of communication terminals joining the multicast service when it is determined that the number of communication terminals joining the multicast service exceeds the predetermined threshold.

Abstract: A multicast control device capable of reducing the processing load of a core network device that occurs when a large number of communication devices use a multicast service is provided. A multicast control device (10) according to the present disclosure includes a communication unit (13) configured to receive a joining request message from a communication terminal to join a multicast service, a determination unit (11) configured to determine whether the number of communication terminals already joining the multicast service reaches a predetermined threshold, and a management unit (12) configured to reject joining of the communication terminal having sent the joining request message to the multicast service when it is determined that the number of communication terminals already joining the multicast service reaches the predetermined threshold.